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FINANCIAL HIGHLIGHTS (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Per Unit Operating Performance:    
Net asset value, beginning of period $ 74.54 $ 63.08
Total income $ (4.78) $ 12.36
Total expenses $ (0.39) $ (0.37)
Net increase in net asset value $ (5.17) $ 11.99
Net asset value, end of period $ 69.37 $ 75.07
Total Return (6.94%) 19.01%
Ratios to Average Net Assets    
Total income (5.93%) 14.08%
Management fees* 0.75% 0.75%
Total expenses excluding management fees* 0.30% 0.66%
Expenses waived* (0.07%) (0.42%)
Net expenses excluding management fees* 0.23% 0.24%
Net income (6.42%) 13.59%